Mask



FIG. 1 is a perspective view of the mask showing our new design;

FIG. 2 is a front elevation view of the mask of FIG. 1;

FIG. 3 is a back elevation view of the mask of FIG. 1;

FIG. 4 is a side elevation view of the mask of FIG. 1;

FIG. 5 is the other side elevation view of the mask of FIG. 1;

FIG. 6 is a top plan view of the mask of FIG. 1; and,

FIG. 7 is a bottom plan view of the mask of FIG. 1.

The broken lines are included for the purpose of illustrating portions of the mask that form no part of the claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 